[Fot] TR3 timing cover bolt threads

[Greg Solow]

The threads in thermostat housing are British Pipe Threads. the threads are 
not tapered, they are parallel threads. USP 3/8 threads are tapered threads. 
The sending unit seals by the threads pushing the sending unit against a 
seat down at the bottom of the treads. The threads themselves do not do the 
sealing as USP threads do.
                                                                             
                            Greg Solow
----- Original Message ----- 
From: "Greg & Alison Blake" <ablake2 at austin.rr.com>
To: <fot at autox.team.net>
Sent: Monday, February 02, 2009 7:33 PM
Subject: Re: [Fot] TR3 timing cover bolt threads


> Thanks all, they are 5/16 x 18.  It had been awhile since they were last
> chased, if ever, it was a very tight fit, which is why I asked.
>
> I've got another thread question.  I am using a mechanical Auto Meter
> water temperature gauge and need to know what those threads are in the
> thermostat housing where the stock temperature bulb (sending unit TR4)
> screws in.  I think it is a 3/8" NPT and if so I think I need Auto Meter
> part number 2263 to screw in there.  Can anyone confirm?
>
> Thanks,
>
> Greg
>
> -----Original Message-----
> From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
> Behalf Of Greg & Alison Blake
> Sent: Sunday, February 01, 2009 4:40 PM
> To: fot at autox.team.net
> Subject: [Fot] TR3 timing cover bolt threads
>
> Stupid question, but what are these threads?  I was cleaning up all the
> treads on my block and the 1/4x20 tap seems slightly small.
>
> Thanks,
>
> Greg
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